layout/xul/nsListItemFrame.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsListItemFrame.h"
   7
   8 #include <algorithm>
   9
  10 #include "nsCOMPtr.h"
  11 #include "nsNameSpaceManager.h"
  12 #include "nsGkAtoms.h"
  13 #include "nsDisplayList.h"
  14 #include "nsBoxLayout.h"
  15 #include "nsIContent.h"
  16
  17 nsListItemFrame::nsListItemFrame(nsIPresShell* aPresShell,
  18                                  nsStyleContext* aContext,
  19                                  bool aIsRoot,
  20                                  nsBoxLayout* aLayoutManager)
  21   : nsGridRowLeafFrame(aPresShell, aContext, aIsRoot, aLayoutManager)
  22 {
  23 }
  24
  25 nsListItemFrame::~nsListItemFrame()
  26 {
  27 }
  28
  29 nsSize
  30 nsListItemFrame::GetPrefSize(nsBoxLayoutState& aState)
  31 {
  32   nsSize size = nsBoxFrame::GetPrefSize(aState);
  33   DISPLAY_PREF_SIZE(this, size);
  34
  35   // guarantee that our preferred height doesn't exceed the standard
  36   // listbox row height
  37   size.height = std::max(mRect.height, size.height);
  38   return size;
  39 }
  40
  41 void
  42 nsListItemFrame::BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
  43                                              const nsRect&           aDirtyRect,
  44                                              const nsDisplayListSet& aLists)
  45 {
  46   if (aBuilder->IsForEventDelivery()) {
  47     if (!mContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::allowevents,
  48                                nsGkAtoms::_true, eCaseMatters))
  49       return;
  50   }
  51
  52   nsGridRowLeafFrame::BuildDisplayListForChildren(aBuilder, aDirtyRect, aLists);
  53 }
  54
  55 // Creation Routine ///////////////////////////////////////////////////////////////////////
  56
  57 already_AddRefed<nsBoxLayout> NS_NewGridRowLeafLayout();
  58
  59 nsIFrame*
  60 NS_NewListItemFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
  61 {
  62   nsCOMPtr<nsBoxLayout> layout = NS_NewGridRowLeafLayout();
  63   if (!layout) {
  64     return nullptr;
  65   }
  66
  67   return new (aPresShell) nsListItemFrame(aPresShell, aContext, false, layout);
  68 }
  69
  70 NS_IMPL_FRAMEARENA_HELPERS(nsListItemFrame)